atl1: fix resume

commit ec5a32f67c603b11d68eb283d94eb89a4f6cfce1 upstream.

adapter->cmb.cmb is initialized when the device is opened and freed when
it's closed. Accessing it unconditionally during resume results either
in a crash (NULL pointer dereference, when the interface has not been
opened yet) or data corruption (when the interface has been used and
brought down adapter->cmb.cmb points to a deallocated memory area).

Signed-off-by: Luca Tettamanti <kronos.it@gmail.com>
Acked-by: Chris Snook <chris.snook@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/atlx/atl1.c b/drivers/net/atlx/atl1.c
index 63b9ba0cc67e13c408686442f1e2fe984ee9b462..bbd6e3009be05d00428f4058a1f6f423ee0e7957 100644 (file)
--- a/drivers/net/atlx/atl1.c
+++ b/drivers/net/atlx/atl1.c
@@ -2847,10 +2847,11 @@ static int atl1_resume(struct pci_dev *pdev)
        pci_enable_wake(pdev, PCI_D3cold, 0);
 
        atl1_reset_hw(&adapter->hw);
-       adapter->cmb.cmb->int_stats = 0;
 
-       if (netif_running(netdev))
+       if (netif_running(netdev)) {
+               adapter->cmb.cmb->int_stats = 0;
                atl1_up(adapter);
+       }
        netif_device_attach(netdev);
 
        return 0;